/*
 * Copyright (C) 2007-2015 FBReader.ORG Limited <contact@fbreader.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.fbreader.formats;

import java.util.*;

import android.os.Build;

import org.geometerplus.fbreader.formats.txt.TxtPlugin;
import org.geometerplus.zlibrary.core.filesystem.ZLFile;
import org.geometerplus.zlibrary.core.filetypes.*;
import org.geometerplus.zlibrary.core.util.SystemInfo;

public class PluginCollection implements IFormatPluginCollection {
    static {
        System.loadLibrary("NativeFormats-v4");
    }

    private static volatile PluginCollection ourInstance;

    private final List<BuiltinFormatPlugin> myBuiltinPlugins =
            new LinkedList<BuiltinFormatPlugin>();
    private final List<ExternalFormatPlugin> myExternalPlugins =
            new LinkedList<ExternalFormatPlugin>();

    public static PluginCollection Instance(SystemInfo systemInfo) {
        if (ourInstance == null) createInstance(systemInfo);
        return ourInstance;
    }

    private static synchronized void createInstance(SystemInfo systemInfo) {
        if (ourInstance == null) {
            ourInstance = new PluginCollection(systemInfo);

            // This code cannot be moved to constructor
            // because nativePlugins() is a native method
            for (NativeFormatPlugin p : ourInstance.nativePlugins(systemInfo)) {
                ourInstance.myBuiltinPlugins.add(p);
            }
        }
    }

    public static void deleteInstance() {
        if (ourInstance != null) {
            ourInstance = null;
        }
    }

    private PluginCollection(SystemInfo systemInfo) {
        if (Build.VERSION.SDK_INT >= 8) {
            myExternalPlugins.add(new DjVuPlugin(systemInfo));
            myExternalPlugins.add(new PDFPlugin(systemInfo));
            myExternalPlugins.add(new ComicBookPlugin(systemInfo));
        }
    }

    public FormatPlugin getPlugin(ZLFile file) {
        final FileType fileType = FileTypeCollection.Instance.typeForFile(file);
        final FormatPlugin plugin = getPlugin(fileType);
        if (plugin instanceof ExternalFormatPlugin) {
            return file == file.getPhysicalFile() ? plugin : null;
        }
        return plugin;
    }

    public FormatPlugin getPlugin(FileType fileType) {
        if (fileType == null) return null;
        for (FormatPlugin p : myBuiltinPlugins)
            if (fileType.Id.equalsIgnoreCase(p.supportedFileType()))
                return p;
        for (FormatPlugin p : myExternalPlugins)
            if (fileType.Id.equalsIgnoreCase(p.supportedFileType()))
                return p;
        return null;
    }

    public List<FormatPlugin> plugins() {
        final ArrayList<FormatPlugin> all = new ArrayList<FormatPlugin>();
        all.addAll(myBuiltinPlugins);
        all.addAll(myExternalPlugins);
        Collections.sort(all, new Comparator<FormatPlugin>() {
            public int compare(FormatPlugin p0, FormatPlugin p1) {
                final int diff = p0.priority() - p1.priority();
                if (diff != 0) {
                    return diff;
                }
                return p0.supportedFileType().compareTo(p1.supportedFileType());
            }
        });
        return all;
    }

    private native NativeFormatPlugin[] nativePlugins(SystemInfo systemInfo);

    private native void free();

    protected void finalize() throws Throwable {
        free();
        super.finalize();
    }
}
